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It's hard to believe that model Christie Brinkley is 63! The mother of three just graced the cover of the annual Sports Illustrated swimsuit issue with her two daughters, and the trio look like they could be sisters.

Brinkley and her daughters Alexa Ray, 31, and Sailor Brinkley, 18, are all color coordinated, and they look downright gorgeous in their black swimsuits.

“My first thought was, ‘At my age? No way!’” Christie explained to People magazine. “When I turned 30, I was like, ‘This is the last time I’m posing in a bathing suit!’ When this issue comes out, I’ll be 63. I thought, ‘Those days are over.’ But to get to do it with my girls, I thought, ‘One last go!’”

The ageless Brinkley first appeared in the magazine in 1979, starring on the cover for the next two years as well. Since then she's gone on to star in numerous fashion spreads and even a few movies! So even though she reportedly retired from bikini shoots in 2004, she hasn't missed a beat.

“In a country that’s very ageist, people love to put you in little boxes,” she says. “Women feel very limited by their numbers. On a personal level, I thought, if I can pull this off, I think it will help redefine those numbers and remove some of the fear of aging.”

NEXT: See Christie Brinkley's husbands through the years!

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She was married at the beginning of her career, but as the world quickly fell in love with the statuesque blonde she divorced her husband and started a series of well-publicized romances.